Abstract

The objective of the thesis consists in modeling, understanding and evaluating how efficiently very complex distributed systems are operated and maintained. We consider that the systems are serving a large-scale organization, composed of sub-organizations which have distinct operational mandates, budgets, goals, managers and staff. We used the User Requirement Notation (URN), an international requirements engineering standard that integrates goal-oriented and scenario based modeling to model a subset of the requirements for the case study system. The requirements we focus on are concerned with the way the operation of the system is organized, how different departments involved in the system activities interact and what is the impact on the realization of their goals. During the construction of the model, an analysis and evaluation was done, allowing to understand some areas of improvement. A new version of the system, called the proposed system is designed, evaluated and compared with the working system.